Isn't your USB drive enough to transport films, music or photos? Then, an external hard drive with higher capacity will come in handy. You have been thinking of upgrading your home/office computer? Then, you need an internal hard drive with a 2.5 inches form factor (for notebooks) or one with a 3.5 inches form factor (for desktop systems and servers). In order to avoid the motherboard incompatibility problems, you should take into consideration the connection interface. Depending on the motherboard, you should choose a hard disk compatible with the spindle speed and the transfer rate. Moreover, because in the hard disk field "more" means "better", it's better to get one with a bigger storage capacity and in this way you''ll avoid future upgrades.